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hwrng: omap3-rom - Handle return value of clk_prepare_enable 

Here, Clock enable can failed. So adding an error check for
clk_prepare_enable.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Arvind Yadav 2017-05-15 13:52:03 +05:30 committed by Herbert Xu
parent cce2ea8d90
commit 986130bf37
1 changed files with 9 additions and 2 deletions
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11
drivers/char/hw_random/omap3-rom-rng.c
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@ -53,7 +53,10 @@ static int omap3_rom_rng_get_random(void *buf, unsigned int count)
cancel_delayed_work_sync(&idle_work);
if (rng_idle) {
clk_prepare_enable(rng_clk);
r = clk_prepare_enable(rng_clk);
if (r)
return r;
r = omap3_rom_rng_call(0, 0, RNG_GEN_PRNG_HW_INIT);
if (r != 0) {
clk_disable_unprepare(rng_clk);
@ -88,6 +91,8 @@ static struct hwrng omap3_rom_rng_ops = {
static int omap3_rom_rng_probe(struct platform_device *pdev)
{
int ret = 0;
pr_info("initializing\n");
omap3_rom_rng_call = pdev->dev.platform_data;
@ -104,7 +109,9 @@ static int omap3_rom_rng_probe(struct platform_device *pdev)
}
/* Leave the RNG in reset state. */
clk_prepare_enable(rng_clk);
ret = clk_prepare_enable(rng_clk);
if (ret)
return ret;
omap3_rom_rng_idle(0);
return hwrng_register(&omap3_rom_rng_ops);